21-NA-210

Bulletin No.:
Service Bulletin
Date:
21-NA-210
August, 2023
INFORMATION
Subject:
Brand:
Chevrolet
Information on A/C Evaporator Rubber Hose Cracking
Model:
Model Year:
from
Bolt EV
2017
Bolt EUV
2022
Involved Region or Country
VIN:
to
from
to
2023
—
—
Engine:
Transmission:
—
—
North America, Brazil, Middle East, GM Korea Company
Condition
5902726
Some customers may comment about visible cracks on the outermost rubber layer of the
air conditioning evaporator hose with no A/C performance concern, as shown in the
picture above.
Cause
This condition may be caused by exposure of the outermost layer of the hose to the
outside environment (ozone).
Correction
Please communicate to the customer that the air conditioning evaporator hose is
functioning as designed and this is a normal condition of their vehicle. Please share this
information with the customer, including a copy of this bulletin.
Copyright 2023 General Motors LLC. All Rights Reserved.
Page 2
August, 2023
Bulletin No.: 21-NA-210
Service Procedure
Important: Service agents must comply with all
International, Federal, State, Provincial, and/or
Local laws applicable to the activities it performs
under this bulletin, including but not limited to
handling, deploying, preparing, classifying,
packaging, marking, labeling, and shipping
dangerous goods. In the event of a conflict between
the procedures set forth in this bulletin and the
laws that apply to your dealership, you must follow
those applicable laws.
No repairs should be attempted for this concern.
Version
2
Modified
Released September 16, 2021
Revised August 11, 2023 – Added the 2023 Model Year and the Important statement.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.
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